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Finding the Fourth Proportional to 777.61, 1,073.62 and 728.02

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Solution

The fourth proportional to 777.61, 1,073.62 and 728.02 is: 1,005.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.61 : 1,073.62 = 728.02 : x
  2. Step 2: Convert to fraction form
    777.61/1,073.62 = 728.02/x
  3. Step 3: Cross multiply
    777.61x = 1,073.62 × 728.02
  4. Step 4: Simplify right side
    777.61x = 781,619.08
  5. Step 5: Solve for x
    x = 781,619.08/777.61
  6. Step 6: Final answer
    x = 1,005.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.